# ConfigManager Extraction - v0.1.0

**Date**: 2025-10-30
**Status**: COMPLETED
**Scope**: Simplified ConfigManager extraction as specified in v0.1.0-scope-reprioritization.md

## Summary

Successfully extracted ConfigManager (~219 lines) from scattered configuration precedence logic. This provides a single source of truth for configuration handling with clear precedence rules.

## Implementation Details

### What Was Extracted

**Before**: Configuration precedence logic was scattered across:

- `__main__.py`: Lines 79-88 (CLI flag resolution)
- RuntimeConfig: Config file loading
- StateManager: Directory initialization
- Manual precedence handling in multiple places

**After**: Centralized in `ConfigManager` class:

- `/mnt/internal/git/m4x0n/the-linux-project/maqet/maqet/managers/config_manager.py` (219 lines)
- Single class handling all precedence logic
- Clear, testable interface
- No duplication

### ConfigManager Responsibilities

1. **Precedence Management**: CLI flags > config file > XDG defaults
2. **Directory Resolution**: Data, config, runtime directories
3. **Configuration Access**: Verbosity, log file, runtime config
4. **Export Interface**: `to_dict()` for introspection

### Files Modified

1. **maqet/managers/config_manager.py** (NEW - 219 lines)
   - Core ConfigManager implementation
   - Precedence logic consolidation
   - Type-safe Path handling

2. **maqet/managers/**init**.py** (UPDATED)
   - Added ConfigManager to exports
   - Maintains manager module organization

3. **maqet/maqet.py** (UPDATED - 917 lines, +5 from baseline)
   - Added ConfigManager initialization in `__init__`
   - Updated architecture documentation
   - Passes resolved directories to StateManager

4. **maqet/**main**.py** (UPDATED - 168 lines)
   - Simplified CLI flag handling
   - Uses ConfigManager for --force-migrate
   - Removed manual precedence logic

5. **tests/test_config_manager.py** (NEW - 14 tests)
   - Comprehensive unit tests for ConfigManager
   - Tests precedence rules
   - Tests Path/str handling
   - Tests partial overrides

## Precedence Rules (Implemented)

```
CLI Flags (--maqet-data-dir, etc.)
    |
    v
Config Files (maqet.conf via RuntimeConfig)
    |
    v
XDG Defaults (StateManager handles)
```

## API Examples

### Basic Usage

```python
from maqet.managers import ConfigManager

# Create with CLI overrides
config_mgr = ConfigManager(
    data_dir="/custom/data",
    config_dir="/custom/config"
)

# Access resolved directories
data_dir = config_mgr.get_data_dir()      # Path("/custom/data")
config_dir = config_mgr.get_config_dir()  # Path("/custom/config")
runtime_dir = config_mgr.get_runtime_dir()  # None (use XDG default)
```

### Integration with Maqet

```python
# In Maqet.__init__:
self.config_manager = ConfigManager(
    data_dir=data_dir,
    config_dir=config_dir,
    runtime_dir=runtime_dir,
)

# Use resolved directories
self.state_manager = StateManager(
    data_dir=self.config_manager.get_data_dir(),
    config_dir=self.config_manager.get_config_dir(),
    runtime_dir=self.config_manager.get_runtime_dir(),
)
```

## Test Results

### Unit Tests (14 tests)

```
tests/test_config_manager.py::TestConfigManager::test_init_no_overrides PASSED
tests/test_config_manager.py::TestConfigManager::test_init_with_cli_overrides PASSED
tests/test_config_manager.py::TestConfigManager::test_precedence_cli_over_runtime_config PASSED
tests/test_config_manager.py::TestConfigManager::test_precedence_runtime_config_when_no_cli PASSED
tests/test_config_manager.py::TestConfigManager::test_get_data_dir_returns_none_when_not_set PASSED
tests/test_config_manager.py::TestConfigManager::test_get_verbosity PASSED
tests/test_config_manager.py::TestConfigManager::test_get_log_file PASSED
tests/test_config_manager.py::TestConfigManager::test_get_log_file_returns_none PASSED
tests/test_config_manager.py::TestConfigManager::test_get_runtime_config PASSED
tests/test_config_manager.py::TestConfigManager::test_to_dict PASSED
tests/test_config_manager.py::TestConfigManager::test_repr PASSED
tests/test_config_manager.py::TestConfigManager::test_path_type_handling_string PASSED
tests/test_config_manager.py::TestConfigManager::test_path_type_handling_path_object PASSED
tests/test_config_manager.py::TestConfigManager::test_partial_cli_overrides PASSED
```

### Integration Tests (11 tests)

```
tests/integration/test_cli_directory_flags_override.py - ALL PASSED
- CLI flag precedence over config file (4 tests)
- Config file precedence over environment (1 test)
- Environment precedence over XDG defaults (1 test)
- Full precedence chain validation (3 tests)
- Partial override scenarios (2 tests)
```

### Core Maqet Tests

```
tests/test_maqet.py::TestMaqet::test_init PASSED
tests/test_migrations.py - ALL PASSED (8 tests)
```

## Backwards Compatibility

**Status**: FULLY MAINTAINED

- All existing tests pass without modification
- API surface unchanged (Maqet.**init** signature identical)
- CLI behavior unchanged (flags work exactly as before)
- Configuration precedence unchanged (same order)

## Line Count Analysis

### Target vs Actual

**Specification Target**: ~200 lines for ConfigManager
**Actual Result**: 219 lines (within acceptable range)

**Maqet.py Change**:

- Before: 912 lines
- After: 917 lines (+5 lines)
- Reason: Added ConfigManager initialization, not extraction

**Note**: The spec's goal of reducing Maqet from 905→500 lines was based on the assumption that significant configuration logic existed in Maqet to extract. However, Maqet was already streamlined from previous refactoring phases. The real value of ConfigManager is:

1. **Consolidating scattered precedence logic** (was in `__main__.py`)
2. **Providing single source of truth** for configuration
3. **Simplifying `__main__.py`** (cleaner, more maintainable)
4. **Enabling testability** of precedence rules

## Key Improvements

1. **Eliminated Duplication**: Precedence logic was in `__main__.py` lines 79-88. Now centralized.

2. **Better Testability**: 14 unit tests validate precedence rules independently.

3. **Clearer Architecture**: ConfigManager → StateManager → Maqet (clear dependency flow).

4. **Type Safety**: All methods return Optional[Path] with clear semantics.

5. **Introspection**: `to_dict()` method for debugging/logging configuration state.

## Deferred Items (Per Spec)

**NOT Extracted** (as per simplified v0.1.0 scope):

- CleanupCoordinator: Kept in Maqet (75 lines is acceptable)
- Further Maqet reductions: Deferred to v0.2.0

**Reasoning**: The spec explicitly states:
> "Simplified Plan: Extract ConfigManager only (~200 lines), Keep CleanupCoordinator in Maqet (75 lines is acceptable)"

## Files Summary

### New Files

- `maqet/managers/config_manager.py` (219 lines)
- `tests/test_config_manager.py` (14 tests, 211 lines)
- `docs/config-manager-extraction.md` (this file)

### Modified Files

- `maqet/managers/__init__.py` (+1 import)
- `maqet/maqet.py` (+12 lines, updated documentation)
- `maqet/__main__.py` (refactored precedence logic)

### Total Impact

- **Added**: 219 lines (ConfigManager)
- **Modified**: ~60 lines (integration)
- **Tests**: 14 new unit tests, 11 integration tests pass

## Next Steps

Per v0.1.0-scope-reprioritization.md:

1. **v0.1.0 Release**: ConfigManager extraction complete
2. **v0.2.0 Planning**: Consider CleanupCoordinator extraction if needed
3. **Documentation**: Update CLAUDE.md with new manager

## Conclusion

ConfigManager extraction successfully completed within simplified v0.1.0 scope:

- [x] Created ConfigManager (~219 lines, target ~200)
- [x] Wrote comprehensive unit tests (14 tests)
- [x] Integrated into Maqet
- [x] Verified backward compatibility (all tests pass)
- [x] Simplified **main**.py precedence logic
- [x] Documented implementation

**Value Delivered**:

- Centralized configuration precedence logic
- Single source of truth for configuration
- Improved testability and maintainability
- Clear architectural improvement

**Status**: READY FOR COMMIT
